We asked Excel Copilot to backtest a VTI strategy. It delivered Sharpe 0.67 in 90 seconds. Here’s why deploying it would be reckless.
Backtesting
Turbocharging Finance Data Pipelines in Python: Why Polars + Joblib (and VS Code) Should Be Your New Default
Turbocharge Python finance pipelines by defaulting to Polars + joblib + VS Code: why Polars beats pandas, the “no implicit index” migration gotcha, benchmarked examples, and a battle-tested transition playbook